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Note 3 - Convertible Debentures (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2015
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Debentures [Member] | Series A Warrant [Member]          
Proceeds from Convertible Debt $ 3,385,000        
Debentures [Member] | Series B Warrant [Member]          
Proceeds from Convertible Debt $ 897,000        
Debentures [Member]          
Debt Instrument, Interest Rate During Period 0.00%        
Potential Proceed from Issuance of Convertible Debt $ 15,000,000        
Gross Proceeds from Convertible Debt $ 5,500,000        
Debt Instrument, Convertible, Conversion Price $ 0.68        
Debt Instrument, Term 30 years        
Debt Instrument, Debt Default, Percentage of Outstanding Principal Amount If Default Is Not Due to Failure to Receive Cirm Grant 130.00%        
Debt Instrument, Debt Default, Percentage of Outstanding Principal Amount If Default Is Due to Failure to Receive CIRM Grant 4.00%        
Registration Rights Agreement Failure to Pay Liquidated Damages Interest Rate 18.00%        
Registration Payment Arrangement, Gains and Losses   $ 220,000 $ 880,000    
Registration Payment   220,000      
Registration Payment Arrangement, Accrual Carrying Value   880,000   $ 880,000  
Proceeds from Convertible Debt $ 4,720,000        
Convertible Debt 0        
Debt Instrument, Unamortized Discount 4,720,000        
Amortization of Debt Discount (Premium)   $ 39,000   $ 52,000  
Payment After Approval of Authorities [Member]          
Potential Proceed from Issuance of Convertible Debt 9,500,000        
Debentures, Beneficial Conversion Feature [Member]          
Proceeds from Convertible Debt $ 438,000        
Series A Warrant [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 22,058,823        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.68        
Warrant Expiration Period 5 years 182 days        
Class of Warrant or Right, Outstanding 8,088,235 8,088,235   8,088,235  
Series B Warrant [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 12,132,353        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.68        
Warrant Expiration Period 1 year 180 days        
Class of Warrant or Right, Outstanding 4,448,529 4,448,529   4,448,529  
Cashless Basis of Class of Warrant to Be Exercised, Weighted Average Price Percentage       90.00%  
Cashless Basis of Class of Warrant to be Exercised Per Share   $ 0.10   $ 0.10  
Cashless Basis of Class of Warrant to Be Exercised, Number of Shares to Be Issued, Uplift Percentage       250.00%  
Potential Proceed from Issuance of Convertible Debt   $ 9,500,000      
Gross Proceeds from Convertible Debt $ 5,500,000        
Approval for Grant in Amount for Clinical Trial $ 10,000,000 10,000,000   $ 10,000,000  
Cashless Basis of Class of Warrant to Be Exercised, Weighted Average Price Percentage 90.00%        
Cashless Basis of Class of Warrant to be Exercised Per Share $ 0.10        
Cashless Basis of Class of Warrant to Be Exercised, Number of Shares to Be Issued, Uplift Percentage 250.00%        
Registration Payment Arrangement, Gains and Losses   (220,000)   (1,100,000)  
Proceeds from Convertible Debt       4,720,000
Convertible Debt   62,000   62,000  
Debt Instrument, Unamortized Discount   $ 4,668,000   $ 4,668,000